If you borrow $150,000, how much could you save over the life of the loan if you took out a 15-year mortgage at 4.5% instead of a 20-year mortgage at 4%?
Part 1
15-year mortgage at 4.5%
r=4.5%=0.045
t=15 years
P=$150,000
I=Prt
I=(150,000)*(0.045)*(15)
I=$101,250
Part 2
20-year mortgage at 4%
r=4%=0.04
t=20 years
P=$150,000
I=(150,000)*(0.04)*(20)
I=$120,000
Find out the difference
$120,000-$101,250=$18,750
therefore
the answer is $18,750